[perl6/specs] 55ef20: Add a note about used on multiple sites.

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/perl6/specs
  Commit: 55ef20a63b1e6920292acf85e9c44a88682f9ec3
      
https://github.com/perl6/specs/commit/55ef20a63b1e6920292acf85e9c44a88682f9ec3
  Author: Zoffix Znet <zoffixz...@users.noreply.github.com>
  Date:   2016-06-10 (Fri, 10 Jun 2016)

  Changed paths:
    M html/perl.css

  Log Message:
  -----------
  Add a note about used on multiple sites.